 Allegro 5.0 - Lab for Editing Vertices of Arcs

   The purpose of this lab is to become familiar with editing lines with arc segments.  This will be accomplished by having the user(you) editing the given sample line as shown.

 1) Select  Edit > Vertex  command.

 2) Edit vertices (v1-v3) by moving them from current location to new location (indicated by arrows), observing dynamics of each move.

 3) Now move the line vertices back to their original locations.

 4) Press <F1> to continue to next frame ...
